Polymer Composite Pin Silicone Rubber Insulator

Polymer Composite Pin Silicone Rubber Insulator is a type of electrical insulator used to support and insulate conductors in power transmission and distribution systems.¹ It’s constructed using a combination of materials to achieve optimal electrical and mechanical performance.²

Key Features:

• Composite Core: Typically made of Fiber Reinforced Polymer (FRP), usually fiberglass encased in a resin matrix.³ This provides high tensile and bending strength while being lightweight.⁴
• Silicone Rubber Housing/Sheds: The outer layer consists of silicone rubber sheds (skirts) that are chemically bonded to the FRP core. Silicone rubber offers excellent hydrophobicity (water-repellent properties), which helps prevent the formation of a continuous water film on the surface, thus reducing leakage current and the risk of flash over, especially in polluted or wet environments.⁵ It also provides superior resistance to UV radiation, ozone, and weathering.⁶
• Pin Design: This insulator type features a central pin, usually made of galvanized steel, for mounting it onto supporting structures like cross-arms. The design is for vertical mounting.
• End Fittings: Metal end fittings (typically forged or cast steel, hot-dip galvanized to prevent corrosion) are securely attached to the FRP core using crimping or other mechanical methods.⁷ These fittings allow for connection to the conductor and the mounting structure.
• Lightweight: Compared to traditional porcelain or glass insulators, polymer composite insulators are significantly lighter, making them easier to handle, transport, and install, reducing the load on supporting structures.⁸
• High Mechanical Strength: The FRP core provides excellent mechanical strength, capable of withstanding significant tensile and bending loads.⁹
• Superior Electrical Performance: Offers high dielectric strength and excellent insulation properties, even under contaminated conditions due to the hydrophobic nature of silicone rubber.¹⁰
• Low Maintenance: The self-cleaning properties of silicone rubber due to its hydrophobicity minimize the need for manual cleaning, reducing maintenance costs.¹¹
• Resistance to Vandalism: Polymer insulators are more resistant to damage from impacts compared to brittle porcelain or glass.
• Long Service Life: The combination of UV-resistant silicone rubber and a strong FRP core contributes to a long and reliable service life.